ios - Why AFNetworking always go into Failure block? -

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i have integrated afnetworking here in project. when request using afnetworking, go failure block. below code. please let me know, doing wrong here?

nsstring *baseurl = @"http://www.nactem.ac.uk/software/acromine/dictionary.py?sf=eta";     afhttpsessionmanager *manager = [afhttpsessionmanager manager];     [manager get:baseurl parameters:nil progress:^(nsprogress * _nonnull downloadprogress) {     } success:^(nsurlsessiondatatask * _nonnull task, id  _nullable responseobject) {         nslog(@"%@",responseobject);     //always invoke failure block     }failure:^(nsurlsessiondatatask * _nullable task, nserror * _nonnull error) {         nshttpurlresponse *response = error.userinfo[afnetworkingoperationfailingurlresponseerrorkey];         nsinteger statuscode = response.statuscode;         nslog(@"error code=%ld",statuscode);         nslog(@"desc=%@",response.description);     }];

note:- valid url. http://www.nactem.ac.uk/software/acromine/dictionary.py?sf=eta

also below error code , description:-

error code 200 error description <nshttpurlresponse: 0x7fbab8509860> { url: http://www.nactem.ac.uk/software/acromine/dictionary.py?sb=hmm } { status code: 200, headers {     connection = close;     "content-type" = "text/plain; charset=utf-8";     date = "wed, 20 apr 2016 00:17:27 gmt";     server = "apache/2.2.15 (scientific linux)";     "transfer-encoding" = identity; } }

i found answer :-

nsstring *url = @"http://www.nactem.ac.uk/software/acromine/dictionary.py?sf=hmm"; afhttpsessionmanager *manager = [afhttpsessionmanager manager];  //missing line (any request or response serializer dealing http encouraged subclass) manager.responseserializer = [afhttpresponseserializer serializer]; [manager get:url parameters:nil progress:nil success:^(nsurlsessiondatatask * _nonnull task, id  _nullable responseobject) { nserror* error; nsdictionary* json = [nsjsonserialization jsonobjectwithdata:responseobject                                                              options:kniloptions                                                                error:&error];         nslog(@"success= %@",json);      }failure:^(nsurlsessiondatatask * _nullable task, nserror * _nonnull error) {         nshttpurlresponse *response = error.userinfo[afnetworkingoperationfailingurlresponseerrorkey];         nsinteger statuscode = response.statuscode;         nslog(@"fail=%ld",statuscode);     }];

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